Method for producing KA oil and adipic acid by utilizing air oxidized cyclohexane based on improved reaction-separation synchronous reactor

Abstract

The invention discloses a method for producing KA oil and adipic acid by utilizing air oxidized cyclohexane based on an improved reaction-separation synchronous reactor. The improved reaction-separation synchronous reactor comprises a bubble gravity reaction tower or stirring reaction tower and a constant-temperature settling tower, wherein an upper gas-phase region, a middle-lower reaction region and a top reaction gas outlet are arranged inside the reaction tower; multiple groups of gravity settling plates are obliquely arranged on the tower wall in the reaction region of the bubble gravity reaction tower, and are distributed alternately; a stirrer is arranged in the reaction region of the stirring reaction tower; and a gas inlet and a gas distributor are arranged in the bottom of the reaction region of the reaction tower. The main improvement of the invention lies in that the bubble gravity reaction tower or stirring reaction tower is connected with the constant-temperature settling tower by virtue of a flange, a microporous filter plate through which a liquid can flow is arranged in the constant-temperature settling tower, and a circulating pipe is arranged at the lower part of the microporous filter plate in the constant-temperature settling tower, and is connected with the upper part of the reaction region of the reaction tower. Cyclohexane is subjected to air oxidation by utilizing the improved device to produce KA oil and adipic acid, overreaction of a product in the reaction tower is reduced, high-purity KA oil and adipic acid can be obtained, the connecting pipeline and circulating pipeline between a reaction kettle and the constant-temperature settling tower are prevented from being plugged, and the KA oil and adipic acid can be respectively effectively separated in time during reactions.

Description

technical field [0001] The invention relates to a method for producing KA oil and adipic acid by using air oxidation cyclohexane based on an improved reaction separation synchronous reactor, and belongs to the technical field of petrochemical industry. Background technique [0002] Chemical production often encounters a reaction in which the specific gravity of the product is greater than that of the reactant and is immiscible with each other. During the reaction, gas, liquid and solid exist in the reaction system at the same time. The chemical production equipment for this type of reaction is a multiphase synchronous reactor. During the entire reaction period, the reactants and reaction products are naturally or forcedly stirred and distributed in the reaction zone. After the reaction is over, the reactant and the reaction product are moved to a separator for separation. Since the existence of multi-phase substances in the system will affect the fluidity of the liquid in t...

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Problems solved by technology

However, this method also has the following defects in actual production. On the one hand, only the mixed product of KA oil and adipic acid can be collected, and must be obtained by further post-separation treatment to obtain KA oil and adipic acid respectively; KA oil and adipic acid products are easily dispersed in the reaction solution under the action of stirring or bubbling, especially when adipic acid just generates crystal nuclei, it is easy to suspend in the reaction solution and is difficult to settle, resulting in side reactions such as decarboxylation and in the process of adipic acid sedimentation, the crystals continue to grow, and it is very easy to crystallize on the inner wall of the pipeline connected between the reaction tower and the settling tower, causing blockage, which must be processed regularly, resulting in complicated processes, which is not conducive to industrial production

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